Declension table of ?avyaya

Neuter	Singular	Dual	Plural
Nominative	avyayam	avyaye	avyayāni
Vocative	avyaya	avyaye	avyayāni
Accusative	avyayam	avyaye	avyayāni
Instrumental	avyayena	avyayābhyām	avyayaiḥ
Dative	avyayāya	avyayābhyām	avyayebhyaḥ
Ablative	avyayāt	avyayābhyām	avyayebhyaḥ
Genitive	avyayasya	avyayayoḥ	avyayānām
Locative	avyaye	avyayayoḥ	avyayeṣu

Compound avyaya -

Adverb -avyayam -avyayāt